My 3BHK hunt in Noida Ext: seeking builder reality checks

Noida Extension — finally taking the plunge, fed up of renting. Landlord ne phir rent badha diya, so EMI vs rent math makes sense. I'm eyeing 3BHKs, around ₹80-90L, especially Sector 150 ya Greater Noida West. Godrej, ATS, Gaursons, ACE Group projects dekhe hain. Main worry hai on-time delivery aur construction quality. In builders ka track record kaisa hai? Suna hai delays hote hain, aur possession ke baad plaster cracks, seepage issues aate hain. Mahagun ya M3M ka experience kaisa raha, especially hidden charges ke liye? Dar lagta hai ki last minute pe bahut extra costs honge. Any first-hand experiences with their customer support? Should I focus on ready-to-move-in flats to avoid delays, ya under-construction mein bhi achhe deals mil sakte hain? Bahut confused hoon.